While I replied with "nonsense" to this there is some truth to the first sentence: "Fingers tend to increase positional flexibility and note selection.".
It's not entirely true, but it is true that string skipping is immediately easier utilizing finger style, and that, on the other hand, fast single note plucking is immediately easier utilizing a pick, when I say immediately, and why the quoted sentence isn't entirely true, is that with proper practice this ought to not really be a limiting issue.
Truth is that the whole pick versus fingers is mainly a question about tone.
There are ways to approximate finger style tone with a pick, as there are ways to approximate pick style tone with your fingers, but it remains an imitation and doesn't really sound like the real deal respectively.